GJ 3090 is a cool M-dwarf (about 0.52 solar masses, 3,707 K, 0.52 solar radii), 22.5 light-years from Earth. GJ 3090 b is a 4.5-Earth-mass planet, with an orbital period of 2.9 days, at 0.032 AU from its star, and an equilibrium temperature near 723 K, on an eccentric orbit (e ≈ 0.25), discovered in 2022 via transit. GJ 3090 c is a 10.0-Earth-mass planet, with an orbital period of 15.9 days, at 0.100 AU from its star, and an equilibrium temperature near 407 K, discovered in 2026 via radial velocity.